Common Equity (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Common Share Activity

A summary of Alliant Energy’s common stock activity was as follows:

Shares outstanding, January 1, 2018	231,348,646
Shareowner Direct Plan issuances	166,527
Equity-based compensation plans (Note 10(b))	5,078
Other	(38,423	)
Shares outstanding, March 31, 2018	231,481,828